Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5da42fb3e7515af…

MALICIOUS

PDF

47.7 KB Created: 2020-11-03 22:11:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: b123452474fc40b08d0ab68541e50e9d SHA-1: bc85c4f4acd7466e63de98e536464a5442f7dcd9 SHA-256: a5da42fb3e7515afe432ddf465b86b583684af0a6542235394bae205f2120d16
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, many of which point to external PDF files, suggesting a link farm or redirection strategy. The primary link, 'https://ggtraff.ru/strik?keyword=how+to+exit+fastboot+mode+in+android', is flagged as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the same URL, reinforcing its role as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ggtraff.ru/strik?keyword=how+to+exit+fastboot+mode+in+android In PDF document text
    • https://cdn-cms.f-static.net/uploads/4370785/normal_5f8bead423459.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369640/normal_5f983fa1d7fa9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411937/normal_5f9b90800d9b3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367268/normal_5f93fa5705215.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393776/normal_5f9e28ab6531c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449014/normal_5f9dfd9f0db42.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406473/normal_5f9e0d5575807.pdfIn PDF document text
    • https://tudanane.weebly.com/uploads/1/3/4/5/134596872/gowudi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/xumakomowi/anglo_norman_period.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/98b36ced-c520-48f1-b591-4844cdb82792/.pdfIn PDF document text
    • https://s3.amazonaws.com/divelikubapiwaj/suxafu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5bdb3b52-3286-4d2b-9015-916a4b4df513/hanuman_chalisa_in_hindi_download_be.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c0dd7f8-0f20-45c4-946e-843877ad1210/latukoxetalad.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000636f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x636F 5280 bytes
SHA-256: 5203c51d71cb28cb969394ae7116e2216b6a32599270d0be8a28ac8104d873dd
font_01_sfnt_off0000755c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x755C 10132 bytes
SHA-256: 28629d708071e6dc4e0e406267a4aa908a26462ecc84766b08f1adf30bb55370
font_02_sfnt_off00009802.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9802 17484 bytes
SHA-256: 3b7a332ad35401f739dd50635bc1392c304010fa51b27a704824eb576bb37502

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